Briareus
In Greek mythology Briareus was one of the 100-armed, 50 headed Hacatoncheries who were born to Gaia and Ouranos. He aided Zeus on the overthrow of the titans. Briareus along with his two brothers Gyes and Kottos was set to guard the fallen titans who were chained down in Tartarus.
John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Briareus, p 72
thestrangemythworld 